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Unread 03-27-2008, 07:26 PM   #1
Duane903
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Black grout is grey, not black....

We installed some 12" tile in the bathroom; the tile is sort of a mottled dark grey/light grey combination. We wanted the 1/8 inch grout lines to be black.

I used Mapei's Kericolor U; when mixed it is very, very black. When dry, however, it is a medium grey.

When I seal the grout, will the black color be restored? Or is there something else I can do to make the grey grout black?

Thanks,

Duane
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Unread 03-27-2008, 07:45 PM   #2
Scottish Tile and Stone
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How long ago did you grout? The finished color, is usually consistent with the color of the powder..
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Unread 03-27-2008, 08:50 PM   #3
ceramictec
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I dont think its grey, I think it's an optical illusion with the tile being more grey and your seeing the grout grey looking.

people always say the grout isnt what they got on its actually grouted in with all of the tile.
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Unread 03-27-2008, 09:01 PM   #4
scuttlebuttrp
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Some blacks are blacker than other blacks. Just like some whites when compared to other whites; look greyish.
Tile color, room color, lighting can all have an effect on the way other colors look.

What was the name of the color you used?
One company has Charchol and Raven. Both black; but Raven was much darker.
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Unread 03-27-2008, 09:31 PM   #5
Duane903
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The color of the grout is, simply, Black.

The grout, when compared next to a white piece of paper, is grey; not even a dark grey. Also, the color of the grout is not uniform - here and there it is black. I just grouted this afternoon; I thought the black grout had not cured at all, and this accounted for the difference between the grey and black areas.

The grout power was distinctly very, very black.

I had some difficulty getting the tile clean of grout. The tile is quite textured, and the grout took some doing to get off. I had to scrub more that on the other
tile jobs I've done, and I think I got the grout wetter as I did so. Could this be part of the problem?
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Unread 03-27-2008, 09:38 PM   #6
Jim wood
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Mapei black grout is dark grey. If you want black I suggest removing the grout and regrouting with Laticrete midnight black, it is truly black.
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Unread 03-27-2008, 11:15 PM   #7
Foochacho
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did you use an additive in your grout ive seen the additives lighten up the color of the grout
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Unread 03-28-2008, 03:17 AM   #8
Duane903
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No, no additive was used.

In researching this issue, it seems to fit the description of efflorescence - when the grout is wetted, it changes color from the medium grey to black.

Incidentally, I agree that this grout even where it is "black" is actually a very dark grey. This color is OK with us, if only I can get the grout to be that same dark very grey color all over, and not mottled.

The tile is a 12 inch, glazed porcelain by Emilceramica.

Does this seem like efflorescence and if so what is the best way to remove the efflorescence?

Thanks!
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Unread 03-28-2008, 03:20 AM   #9
scuttlebuttrp
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The water can definitely wash the grout out so it becomes lighter. I think the main thing though is your not happy with the color? Would it be difficult to remove the grout and use one that is blacker? Like the midnight Black mentioned? I don't remember who made Raven but it was pretty dark.
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Unread 03-28-2008, 03:26 AM   #10
Duane903
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It's mainly the mottled appearance (see above post). If we can get a uniform color all over, it would be OK.

My preference would be to salvage what is already installed because removing grout sounds like a bear of a job - or is there some easy way to do it?
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Unread 03-28-2008, 04:21 AM   #11
lou432
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Duane, sorry to hear bout your delima , sounds like efflorescence ti me ,but I aint there . The few times I have had issues with your descriptions it was too much water in the mix & to much water in the cleaning . Sounds like you had a difficult time cleaning it which means you may have introduced too much water in that stage & IMHO, black is one of the worse for this . I guess it don`t matter !! You want it fixes, right?
I doubt you`d get it to change by doing a mild vinegar & water wash so ya got at least 2 choices. Dig it out & replace it ( it may come out fairly easy if there was to much water introduce ,it has a tenancy to weakn the grout) .
or use a grout re-colorant ,which you kinda paint on, stuff I`ve used works great!!!!!! I`ll try to finda link. >>>>>>

http://www.installerstore.com/produc...&cat=35&page=1


it re colors & seals the grout ,2n1

Good Luck
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Unread 03-28-2008, 05:47 AM   #12
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Unread 03-28-2008, 05:59 AM   #13
lou432
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Chuck, been there & done that & it worked spot on good !!!! but it was only a few splotchy areas on a small countertop but it does work.
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Unread 03-28-2008, 02:31 PM   #14
Duane903
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I've read about acid washes - vinegar or Sulfamic acid - to remove efflorescence.

Can anyone guide me in the use of either of these acids? How long should the grout cure before using them, amount of acid, method of application and removal, etc?

Thanks,
Duane
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Unread 03-28-2008, 03:10 PM   #15
Scooter
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Grout always dries lighter than it appears in the store.
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